黑龙江干流中俄界河中游段汊道鸟屿主流变动分析
Analysis for the mainstream variation of island and offshoot in the Heilongjiang River
物种损失的原因是生境面积的大量损失和鸟屿化过程的加剧。
Species are lost because of the overall loss of habitat area , and as a result of increasing insularization .
鸟屿